Sealed modular downhole antenna

Details Sealed modular downhole antenna Sealed modular downhole antenna

1996-04-15

1997-08-26

O'Shea, Sandra L.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

343842, G01V 328, H01Q 704

Patent

active

056614020

ABSTRACT:
A sealed, modular downhole antenna for measuring electrical characteristics of wellbore fluids and formations. An antenna includes a thin-walled curved metal tube, which houses coil of a length of conductive wire. The wire may be insulated by an insulating coating, as well as a filler that resides in the tube. The tube includes a coupling gap, to facilitate coupling electromagnetic energy through the tube, to and from the conductive wire. The tube also has a wall opening, for ends of the wire to attach to an adapter-connector. The adapter-connector includes suitable features for modular connection to an electrical cable, electrical connectors, or other electrical equipment. Features of the invention may be provided to ensure that such connection is resistive to the high pressures that are often encountered downhole. In this respect, the tube may be also coated with a sealant layer, to hermetically seal the tube, coupling gap, and junction between the adapter-connector and the tube. The sealant layer may include features to facilitate locking engagement with complimentarily sized attributes of a downhole tool.

REFERENCES:
patent: 4373163 (1983-02-01), Vandebult
patent: 4739272 (1988-04-01), Griffin et al.
patent: 5157331 (1992-10-01), Smith
patent: 5212495 (1993-05-01), Winkel et al.
patent: 5363113 (1994-11-01), Mametsa et al.
patent: 5402068 (1995-03-01), Meador et al.

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